Referring to data.table columns by names saved in variables

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  1. data.table vs dplyr: can one do something well the other can’t or does poorly?
  2. How do you delete a column by name in data.table?
  3. Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
  4. Replacing NAs with latest non-NA value
  5. What does .SD stand for in data.table in R
  6. Fastest way to replace NAs in a large data.table
  7. How to delete a row by reference in data.table?
  8. Assign multiple columns using := in data.table, by group
  9. Why is rbindlist “better” than rbind?
  10. Split comma-separated strings in a column into separate rows
  11. Why does X[Y] join of data.tables not allow a full outer join, or a left join?
  12. Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.9.4 or earlier
  13. Unique combination of all elements from two (or more) vectors
  14. Cleaning `Inf` values from an R dataframe
  15. What is the purpose of setting a key in data.table?
  16. Pass column name in data.table using variable [duplicate]
  17. dplyr mutate/replace several columns on a subset of rows
  18. Apply a function to every specified column in a data.table and update by reference
  19. Repeat rows of a data.frame N times
  20. How to replace NA values in a table for selected columns
  21. Generate a dummy-variable
  22. Use a value from the previous row in an R data.table calculation
  23. How to get week numbers from dates?
  24. Using data.table package inside my own package
  25. Remove multiple columns from data.table
  26. How to group data.table by multiple columns?
  27. Summarizing multiple columns with data.table
  28. .EACHI in data.table?
  29. Proper/fastest way to reshape a data.table
  30. Select subset of columns in data.table R [duplicate]
  31. Using .I to return row numbers with data.table package
  32. How to select columns in data.table using a character vector of certain column names? [duplicate]
  33. Why is plyr so slow?
  34. best way to transpose data.table
  35. Remove rows conditionally from a data.table in R
  36. Insert a row in a data.table
  37. What is the practical difference between data.frame and data.table in R [duplicate]
  38. How does one change the levels of a factor column in a data.table
  39. When should I use setDT() instead of data.table() to create a data.table?
  40. How to do a data.table merge operation
  41. Possible to print more than 100 rows of a data.table?
  42. Faster way to read fixed-width files
  43. Why has data.table defined := rather than overloading
  44. Rounding selected columns of data.table
  45. Why does data.table update names(DT) by reference, even if I assign to another variable?
  46. R data.table sliding window
  47. Join inherited scope with by in data.table
  48. data.table “key indices” or “group counter”
  49. data.table “key indices” or “group counter”
  50. rolling joins data.table in R

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